Add more functional tests

[jschaeff]

Wherever there is logic in the code, we should test that it does what it should.

For instance the restriction function with those use cases:

• node with default policy OPEN, network without restriction inversion
• node with default policy OPEN, network with restriction inversion
• node with default policy CLOSED, network with restriction inversion
• node with default policy CLOSED, network without restriction inversion

[vpet98]

How can I skip the authentication part that the methods include to test all these? I cannot acquire a token at testing time. Shall I change the code to accept a parameter testing=True/False?